(19)
(11) EP 0 076 665 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
18.05.1983 Bulletin 1983/20

(43) Date of publication A2:
13.04.1983 Bulletin 1983/15

(21) Application number: 82305238

(22) Date of filing: 01.10.1982
(84) Designated Contracting States:
AT BE CH DE FR GB IT LI LU NL SE

(30) Priority: 02.10.1981 US 308055

(71) Applicant: E.I. DU PONT DE NEMOURS AND COMPANY
 ()

(72) Inventor:
  • Ramstack, Joseph Michael
     ()

   


(54) Method and apparatus for plasmapheresis


(57) Plasmapheresis by filtration can be carried out with high efficiency for long periods by conducting blood over a surface of a membrane and passing plasma at an accelerating rate until the threshold level is attained, maintaining the rate of passing plasma until the ceiling system transmembrane pressure difference is attained and then reducing the passing of plasma and the system transmembrane pressure difference and allowing the membrane to clear before repeating the cycle.






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